/Engine/Source/Editor/StaticMeshEditor/Public/StaticMeshEditorSubsystem.h
Build a proxy mesh actor that can replace a set of mesh actors.
Success of the proxy creation
bool CreateProxyMeshActor ( const [TArray](API\Runtime\Core\Containers\TArray)< class [AStaticMeshActor](API\Runtime\Engine\Engine\AStaticMeshActor) * > & ActorsToMerge, const [FCreateProxyMeshActorOptions](API\Editor\StaticMeshEditor\FCreateProxyMeshActorOptions) & MergeOptions, class [AStaticMeshActor](API\Runtime\Engine\Engine\AStaticMeshActor) *& OutMergedActor )